Update yarn version in setup.md
Update yarn version in setup.md

yarn version should match #5335
shiftkey/desktop,artivilla/desktop,j-f1/forked-desktop,desktop/desktop,artivilla/desktop,shiftkey/desktop,kactus-io/kactus,say25/desktop,say25/desktop,kactus-io/kactus,shiftkey/desktop,shiftkey/desktop,j-f1/forked-desktop,desktop/desktop,desktop/desktop,kactus-io/kactus,artivilla/desktop,say25/desktop,artivilla/desktop,desktop/desktop,say25/desktop,j-f1/forked-desktop,j-f1/forked-desktop,kactus-io/kactus